Anthony “Mad Dog” Macias (born February 9, 1971) is an American mixed martial artist, who currently competes in the middleweight division. Macias was introduced to MMA in a fight against Dan Severn at UFC 4, which Macias lost by submission. His nickname, “Mad Dog”, comes from his vicious style in the way he fights, reflected by the fact that only three of his 42 fights ended via decision.